Get your thinking caps on -it's time for our collaboration with the always amusing What Is It? Blog! Do you have any idea what this contraption is? Can you come up with an interesting guess?

Place your guess in the comment section below. One guess per comment, please, though you can enter as many as you'd like. Post no URLs or weblinks, as doing so will forfeit your entry. Two winners: the first correct guess and the funniest (albeit ultimately wrong) guess will win T-shirt from the NeatoShop!

Please write your T-shirt selection alongside your guess. If you don't include a selection, you forfeit the prize, okay? May we suggest the Science T-Shirt, Funny T-Shirt and Artist-Designed T-Shirts?

For more clues, check out the What Is It? Blog. Good luck!

Update: ladybuggs was the first of many with the correct answer. This is a National Cash Register Stamping Phone, used in bigger department stores. It was for clerks to get approval from "credit specialists" in the back room for customers to charge their purchases. Read more about them here. The funniest answer came from next2exits, who declared that this is a Wisconsin voter polling station. The handset allows the governor to call you and tell you who to vote for.